21481781683259 has 8 divisors (see below), whose sum is σ = 21540741431808. Its totient is φ = 21422824252200.

The previous prime is 21481781683253. The next prime is 21481781683273. The reversal of 21481781683259 is 95238618718412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21481781683259 is a prime.

It is a super-2 number, since 2×21481781683259² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21481781683195 and 21481781683204.

It is not an unprimeable number, because it can be changed into a prime (21481781683253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18880304 + ... + 19985730.

It is an arithmetic number, because the mean of its divisors is an integer number (2692592678976).

Almost surely, 2^{21481781683259} is an apocalyptic number.

21481781683259 is a deficient number, since it is larger than the sum of its proper divisors (58959748549).

21481781683259 is a wasteful number, since it uses less digits than its factorization.

21481781683259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158745.

The product of its digits is 46448640, while the sum is 65.

The spelling of 21481781683259 in words is "twenty-one trillion, four hundred eighty-one billion, seven hundred eighty-one million, six hundred eighty-three thousand, two hundred fifty-nine".